Friction-band clutch.



S. C. CARTER.

FRICTION BAND GLUTGH.

APPLICATION FILED 00121, 1912.

604 5 4 w 1% w w MM a Z Smue a? Patented Feb. 16, 1915.

l n r Zi/i'inesses %/x THE NORRIS PETERS C0,. PHOTOLITHQ, wAsHINGrcw. D C

'. SAMUEL C. {CARTERIOLF LOS 'ANGEIIES, 'UAIIFORNIA.

"IRICTION BAND CDU'I'CH.

Specification of Bette'rs'Tatent.

PatentedKFeb.16,1915.

. nppiication filed Qcteber. 2 1,119 12. :SerialaNo. 7215174.

JoaZZ whom it may concern: ...Be..it.k:no.Wn .that L SAMUEL-C. CARTER, .a (citizen of the. United States, .residing at .LosiAngeles, in thezcountycf Los. Angeles zand State? of iCalifornia,.\have invented new .and useful improvements .in .ErictionrBand Clutches, of .which' -thefollowing is aspeci- .fication.

uOne object of my invention: is .to ,provide a. :clutch :which may easily be .thrown: into .and-out .ofengagementwith the expenditure .of little manual-effort, .special-antifriction means being ,provided ,for relieving the sliding friction occasioned .by .the reaction 5 of. the clutching members while being thrown intoand out ofoperation.

Another obj ect of :my invention is to .provide the. clutch with governing means whereby the clutching elements "are caused 2Qit0 bind: each other more securely as .the speed of rotation of the :shafts increases, thus. counteracting .the normal slipping tendency which increases .also .withthe speed.

Novel features xandelements showna'nd. described, but not claimed intthis' application, .are claimed in my zoo-pending application, entitled Eriction .band: clutch, Serial No. 5 3.137.

Theaccompanying drawingsillustrate the invention.

Figure dis a fragmentalbroken plan view partly inrsection on'line w wt of Figs. .2 iand.3,.sh.owing the clutch inengagezment, a fragmentof the flywheel, to which the clutchfis :eonneeted, being :shown .also. lDotted Iinesindicate the .position er parts when the clutch .isdisengaged. .Fig. 2; is a :Eragmental broken .sectional view. from 11'- regularlines 33%, .Figs. .1 3 and .4:, with ,parts in-the'pos itionhshovvn in .Fig. 1. .Dotted lines indicate vthe position j of parts when .the icl-n-tch is disengaged: :Fig. 3.;is asideele- 'vation of .the iclutchiemhodyi ng my inven- .tion.. Fig. 4.is a..mid.-section mnnm ag lEigs. 2iandi3.showingstheiclntchdisengaged corresponding to the ,rpQsitiomindicated ,by dotted. lines. in Figs. Ilsand. 2.. .Eig. .5. is .a detached. side view of..the. .sleeve in -which 0 the cam-piece is carried. llEig. 5 isianelevationnfrom..thedeftiof E .Fig. 7 is a vperspective. .viewb'f .themam-piece.

I .Iheexternal bandcarnying onember .1.-is .2. housing :,mounted.,ion...and rotating with :.the power. ishaft 2,.. and islfixedito the flyk326i. saidslia'ft ,byi.' cap ;scre:ws 4. .x-

tending through: :holes 5 in ;thefl-flange .16. Said member has abent web .7 .in which is :fomnedaspring seatr8, and is provided with a sleeve:or.collar 9ithat surround sand may revolve .on the adjacent end of the. transmission shaft 10, the .collar 9 .heingJQOnisidered a continuation:ofshaft. .2.

' The internal clutchmember comprises .a flange 11 integral. with the transmission shaft s10, or attached tothesamednany suitable manner, and carrying ;the longitudiinally extending .drumor friction .face .12. Normally the friction face is gripped Joy a friction band 13 .carried by .theexternal .member 1,. and haivinga lining or pad 21.4 of asbestos, fiber, .or other suitable material attached to its inner gripping facebyrivets 15. Lugslfi :and17, securedstotheextremi- .ties of band 13 extend through .slot 18 in the external .member, said Ilugs rhaving connection .from .the outside with :linkmeansfor contracting the bandonto thefrictioniace .12. .It will .be understood thatband .13, is made OfrStBGl orothenresilient materialhaving anormal tendency toexpand, and when unrestrained will expand .ofl' .the. friction .;.face into theposition shown in Fig. 4,.thus disconnecting the external .from. the. internal members, and. accordingly disconnecting the power from the transmission ishaft.

19 is a rigid adjustable anchor linkipiv- ,oted. at one end. to 1ug16 by pin .20,w:and isv adjustably. anchored and .pivotally. mounted at .the. other end to the external ,member '1 by nuts .21 bearing on the swivel-pin22 journaled in bearings 23...0n the external clutch member. .The operating link .24, preferably provided between its. ends with a .nniversal j0int..25,. is.pivo.ted at one .end by pin 26 to the lug 1"Z;,..and.at the other end bypin .27 to ,an. arm'28 .on' the handi.operatingerockfshaft:29, .thesaidrockshaft .Ibeing ijournaled; in .cappedbearingsBO.

.UlMounted upon .theroek-shaft'29 .the .arm .31 .provided with .forks 32 between .which is carried ,pinu33, zrevolubly support- ,ing the.r.ollerffollower.34.

islidably mountedupon theicollarfi is the sleeve 35 ;provided with ,a key'slot .3.6.in fwhichrruns key. 37 rigidly attacheditofcollar .9. .Ilhis :sleeve {35 formed with (a .llongitndinal ..slot .38. out completely throughcne side of the sleeve in raniaxialplaneandaalso .with.a..dLum..3.Q.for:-a pnnpose described be- Qlowlf I'DhecOllarI 5Q,..mounted1on. drum... 39. of

sleeve; 35,. is secnred againsteshaulder 41 by suitable means, key lug 42 preventing the collar from rotating on the drum. Upon drum 39 is also mounted collar 43 which is attached to the forked arm 44 through pins 45, the said arm 44 being rigidly attached to shaft 46, which may be rotated by operating pedal 47. Between the collars 40 and 43, is provided the antifriction ring 48 containing ball bearings 49, said antifriction ring relieving the friction between rotating collar 40, and stationary collar 43. T o retain the collar 43 on sleeve 35, nut 50 is screwed to the threaded extremity 51 of the sleeve, and prevents the collar from slipping off said extremity.

Fig. 7 shows in detail the cam piece 52 made of steel, and having shakers 53 and 54, shellac trough 63, and wedge face 64. The cam piece is adapted to lie' in slot 38 of sleeve 35, having free axial motion with respect to the sleeve but being restrained from longitudinal motion along same by the shoulder 53 abutting collar 40, and by shoulder 54 abutting collar 55, the latter being rigidly attached to the sleeve in any suitable manner.

Into the collar 9 at a point below the cam piece 52 is cut the run-way 56 best seen in Fig. 4. In this run-way is the antifriction sheet 57. containing ball bearings 58 for purpose made clear below.

The longitudinal sliding motion of sleeve 35 on collar 9 is limited by shoulder 59 on cam piece 52 which shoulder abuts the face 60 at one extremity of way 56 limiting the travel of the sleeve in this direction, and abuts antifriction sheet 57, while in contact with the other face 61 of the way 56, thus limiting the travel of the sleeve in this direction.

Spring 62 is located between the seat 8 of Web 7 and the collar 55 on sleeve 35, its tension constantly forcing the sleeve toward the right in Fig. 4. The antifriction sheet 57 assists the spring 62 in its operation, making a lighter spring possible and thereby reducing the manual effort necessary to operate said spring when the clutch members are separated.

\Vhen the shafts are not connected through the clutch the roller follower 34 rides in the shallow trough 63 on the cam piece 52. To disconnect the clutch, the sleeve 35 has been forced to its extreme left position in Fig. 4, by turning pedal 47 in the direction indicated by the arrow in Fig. 3. This rotation of the pedal is transmitted through shaft 46, forked arm 44, collar 43, and antifriction plate 48 to the collar 40, sleeve 35, and cam piece 52, it being understood that this motion of the sleeve is resisted by the spring 62.

'With the clutch disconnected and the power shaft 2 and flywheel 3 rotating, the

external member 1 and sleeve 9 rotate about the shaft 10 which remains motionless. Along with the collar 9, rotates sleeve 35, collar 40, and cam piece 52, the roller follower 34 retaining its position on the cam piece as in Fig. 4, since the same, being indirectly mounted on the external member 1, rotates synchronously with the sleeve 35, and therefore retains the same relative position with respect to the same.

As will be readily understood the collar 43 does not rotate and hence the desirability of providing antifriction means 48 between it and the rotating collar 40, for reducing the friction especially during the period when the clutching force is being transmitted between the said collars.

When it is desired to connect the transmission shaft 10 to power shaft 2, the pedal 47 is released and the spring 62, acting through collar 55, will throw sleeve 35 to the right on collar 9. The roller follower 34 will be forced up onto the wedge face 64 of cam piece 52, turning arm 31 so as to revolve the rock shaft 29, arm 28, and connecting link 24 in a manner that will be apparent from the drawings. This motion is transmitted to lug 17 and will carry the extremity of the friction band toward lug 16, thus binding the asbestos or fiber lining 14 to the internal friction face 12. This friction face being directly connected to the transmission shaft 10 completes a clutching connection from the power shaft to the transmission shaft and will cause the latter to rotate with the former.

In binding the friction band 13 tight to the face 12 considerable force must be transmitted through the roller follower 34, which in turn reacts against cam piece 52 forcibly. In order that this reaction may not be transmitted to the sleeve 35, the sliding friction of which, on the collar 9, would be .very considerably increased, the cam piece 52 is made as a separate member, and beneath it is located the antifriction means 57. \Vith this construction obviously none of the reaction is transferred to sleeve 35 but is transmitted in totum through the cam piece 52 to the antifriction expedient which carries the reaction during the sliding motion and reduces the sliding friction to a minimum. From this it will be clear that the physical force necessary to operate pedal 47 will also be reduced to a minimum, my construction thus providing a clutch which responds readily and avoids the annoyance of occasional bucking common to clutches where the clutching reaction is carried by the sliding sleeve itself.

As the speed of the power shaft is increased the slipping tendency between the friction pad 14 and face 12 is also increased owing partly to increased centrifugal force tending to throw the band off face 12, and partly to the increased power which is being transmitted from the pad to the friction face. In order to counteract this increased slipping tendency I provide the lever 65 fulcrumed to the flange 6 by pin 66. The lever 65 is provided at one extremity with the weight 67 and at the other extremity is connected through link 68 to the pin 27 and thence to the actuating extremity of the friction band by linkage 28, 24, 26, previously described. Link 68 is preferably provided with the universal joints 69 and 70.

In operation the centrifugal force acting to throw weight 67 from the shaft center, acts through lever 65, and links 68 and 24 to bind the extremity of the friction band tighter to the friction face 12. It will. be readily understood that this compensating action increases as the speed of rotation of the shafts increases and will bind the friction band to the friction face more securely during the condition of higher speeds, thus avoiding the slip commonly experienced.

I claim:-

1. In a clutch, the combination of a rotatable member and a second rotatable memher, a. friction band operatively connected to the first said member and adapted to frictionally engage the said second member, means including a cam follower for causing said friction band to engage the second said member, a sleeve slidable along the first said member, said sleeve having a slot, a campiece for operating said follower, said cam piece being detachably carried by said sleeve so that it may be removed in a radial direction through the slot of said sleeve.

2. In a friction clutch, a rotatable member and a second rotatable member, a friction band operatively connected to the first said member,said friction band being adapted to frictionally engage the second said member, means including a cam follower for causing said friction band to engage the second said member, a sleeve slidable along the first said member, and said sleeve having a slot,a cam piece for operating said cam follower, said cam piece being detachably carried by said sleeve so that it may be re- Copies of this patent may we obtained for moved in a radial direction through the slot of said sleeve, a race-way cut in the first said member immediately below said cam piece, anti-friction means restrained within said race-way and adapted to sustain the radial thrust of said cam piece as it operates said cam follower; and means for sliding said sleeve and cam piece along the first said member.

3. In a friction clutch, the combination of a rotatable member, a second rotatable memher, a friction band operatively connected to the first said member, said friction band being adapted to frictionally engage the second said member, means including a cam follower for causing said friction band to engage said second member, a sleeve adapted to slide along the first said member, said sleeve having a slot for operating said cam follower, said cam piece being detachably carried by said sleeve, so that it may be removed in a radial direction through the slot of said sleeve, a race-way in the first said member immediately adjacent said cam piece, said race-way having terminal shoulders, an inwardly extending shoulder on said cam piece adapted to abut one of said terminal shoulders for limiting the sliding motion of said cam piece in one direction, a bar slidable in said race-way between the other terminal shoulder and the shoulder on the cam piece, said bar and the two last said shoulders being adapted to abut one another so as to limit the sliding motion of said cam piece in the other direction, said bar carryin anti-friction balls adapted to support the radial thrust of said cam piece as it operates said cam follower; and means for sliding said sleeve and cam piece along the first said member.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 8th day of October, 1912.

SAMUEL C. CARTER.

In presence of- J AMES R. TOWNSEND, L. BELLE RICE.

five cents each, by addressing the Commissioner of Patents,

Washington, D C. 

